I'm having Android code to move, zooming and rotation image. And it working perfect. Now I want to set ellipse on the image and changing it place upon image changes. The ellipse is drawing perfect in moving and zooming cases, but I don't know how to set new points for the ellipse if I rotate the image. this is the code I'm using: @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); if (!isInitialized) { int w = getWidth(); int h = getHeight(); position.set(w / 2, h / 2); isInitialized = true; } Paint paint = new Paint(); matrix.reset(); matrix.postTranslate(-width / 2.0f, -height / 2.0f); matrix.postRotate(getDegreesFromRadians(angle)); matrix.postScale(scale, scale); matrix.postTranslate(position.getX(), position.getY()); canvas.drawBitmap(bitmap, matrix, paint); try { float x=250; float y=200; float[] values = new float[9]; matrix.getValues(values); x =values[Matrix.MSCALE_X]*x+values[Matrix.MTRANS_X]; y =values[Matrix.MSCALE_Y]*y+values[Matrix.MTRANS_Y]; paint.setColor(0xFF007F00); canvas.drawCircle(x, y, 15, paint); } catch(NullPointerException e) { // Just being lazy here... } }

Instead of extracting the elements of the Matrix and doing your own matrix calculations, use the mapPoints() method of the Matrix class (that is what the method is for).